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// **********************************************************************
//
// Copyright (c) 2003-2016 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <Slice/Util.h>
#include <IceUtil/InputUtil.h>
#include <IceUtil/StringConverter.h>
#include <ostream>
#include <iomanip>
using namespace std;
using namespace Slice;
using namespace IceUtil;
using namespace IceUtilInternal;
namespace
{
class StringLiteralGenerator
{
public:
StringLiteralGenerator(const string&, const string&, EscapeMode, unsigned char);
string escapeASCIIChar(char) const;
string escapeCodePoint(unsigned int) const;
string flushU8Buffer(vector<unsigned char>&) const;
private:
const string _nonPrintableEscaped;
const string _printableEscaped;
const EscapeMode _escapeMode;
const unsigned char _cutOff;
};
StringLiteralGenerator::StringLiteralGenerator(const string& nonPrintableEscaped,
const string& printableEscaped,
EscapeMode escapeMode,
unsigned char cutOff) :
_nonPrintableEscaped(nonPrintableEscaped),
_printableEscaped(printableEscaped + "\\\""),
_escapeMode(escapeMode),
_cutOff(cutOff)
{
}
string
StringLiteralGenerator::escapeASCIIChar(char c) const
{
assert(static_cast<unsigned char>(c) < 128);
string result;
if(_nonPrintableEscaped.find(c) != string::npos)
{
switch(c)
{
case '\a':
{
result = "\\a";
break;
}
case '\b':
{
result = "\\b";
break;
}
case '\f':
{
result = "\\f";
break;
}
case '\n':
{
result = "\\n";
break;
}
case '\r':
{
result = "\\r";
break;
}
case '\t':
{
result = "\\t";
break;
}
case '\v':
{
result = "\\v";
break;
}
case '\0':
{
result = "\\0";
break;
}
case '\x20':
{
result = "\\s";
break;
}
case '\x1b':
{
result = "\\e";
break;
}
default:
{
// The caller cannot add additional non-printable ASCII characters!
assert(0);
}
}
}
else if(_printableEscaped.find(c) != string::npos)
{
result = '\\';
result += c;
}
else if(c >= 32 && c <= 126)
{
// Other printable ASCII
result = c;
}
else
{
// Other non-printable ASCII character
ostringstream os;
if((static_cast<unsigned char>(c) < _cutOff) || (_escapeMode == Octal))
{
os << "\\" << oct << setfill('0') << setw(3) << static_cast<unsigned int>(c & 0xFF);
}
else
{
os << "\\u" << hex << setfill('0') << setw(4) << static_cast<unsigned int>(c & 0xFF);
}
result = os.str();
}
return result;
}
string
StringLiteralGenerator::escapeCodePoint(unsigned int codePoint) const
{
if(codePoint < 128)
{
return escapeASCIIChar(static_cast<char>(codePoint));
}
else if(_escapeMode == Octal)
{
vector<unsigned int> u32buffer;
u32buffer.push_back(codePoint);
vector<unsigned char> u8buffer = fromUTF32(u32buffer);
ostringstream os;
for(vector<unsigned char>::const_iterator q = u8buffer.begin(); q != u8buffer.end(); ++q)
{
os << "\\" << setfill('0') << setw(3) << oct << static_cast<unsigned int>(*q);
}
return os.str();
}
else
{
ostringstream os;
if(codePoint < _cutOff)
{
//
// Output octal escape
//
os << "\\" << setfill('0') << setw(3) << oct << codePoint;
}
else if(codePoint <= 0xFFFF)
{
os << "\\u" << setfill('0') << setw(4) << hex << codePoint;
}
else if(_escapeMode == ShortUCN)
{
//
// Convert to surrogate pair
//
unsigned int highSurrogate = ((codePoint - 0x10000) / 0x400) + 0xD800;
unsigned int lowSurrogate = ((codePoint - 0x10000) % 0x400) + 0xDC00;
os << "\\u" << setfill('0') << setw(4) << hex << highSurrogate;
os << "\\u" << setfill('0') << setw(4) << hex << lowSurrogate;
}
else if(_escapeMode == EC6UCN)
{
os << "\\u{" << hex << codePoint << "}";
}
else
{
os << "\\U" << setfill('0') << setw(8) << hex << codePoint;
}
return os.str();
}
}
string
StringLiteralGenerator::flushU8Buffer(vector<unsigned char>& u8buffer) const
{
if(u8buffer.empty())
{
return "";
}
else
{
ostringstream os;
vector<unsigned int> u32buffer = toUTF32(u8buffer);
for(vector<unsigned int>::const_iterator p = u32buffer.begin(); p != u32buffer.end(); ++p)
{
os << escapeCodePoint(*p);
}
u8buffer.clear();
return os.str();
}
}
}
string
Slice::toStringLiteral(const string& value,
const string& nonPrintableEscaped,
const string& printableEscaped,
EscapeMode escapeMode,
unsigned char cutOff)
{
StringLiteralGenerator generator(nonPrintableEscaped, printableEscaped, escapeMode, cutOff);
ostringstream os;
if(escapeMode != Octal)
{
vector<unsigned char> u8buffer; // Buffer to convert multibyte characters
for(size_t i = 0; i < value.size(); ++i)
{
char c = value[i];
if(static_cast<unsigned char>(c) >= 128)
{
// New UTF-8 byte
u8buffer.push_back(static_cast<unsigned char>(c));
}
else
{
//
// First write any outstanding UTF-8 -encoded characters
//
os << generator.flushU8Buffer(u8buffer);
if(c == '\\')
{
if(i + 1 == value.size())
{
// trailing backslash, add a second one
os << "\\\\";
}
else
{
c = value[++i];
if(c == '\\')
{
os << "\\\\";
}
else if(c == 'u' || c == 'U')
{
size_t sz = c == 'U' ? 8 : 4;
string codePointStr = value.substr(i + 1, sz);
assert(codePointStr.size() == sz);
IceUtil::Int64 v = IceUtilInternal::strToInt64(codePointStr.c_str(), 0, 16);
if(v < 128)
{
// ASCII character that may need to escaped in languages such as Java
os << generator.escapeASCIIChar(static_cast<char>(v));
}
else if(escapeMode == UCN || c == 'u')
{
// keep this escape as is
os << "\\" << c << codePointStr;
}
else
{
os << generator.escapeCodePoint(static_cast<unsigned int>(v));
}
i += sz;
}
else
{
// unescaped backslash: escape it!
os << "\\\\";
os << generator.escapeASCIIChar(c);
}
}
}
else
{
os << generator.escapeASCIIChar(c);
}
}
}
//
// Write any outstanding UTF-8 -encoded characters
//
os << generator.flushU8Buffer(u8buffer);
}
else
{
assert(escapeMode == Octal);
for(size_t i = 0; i < value.size(); ++i)
{
char c = value[i];
if(static_cast<unsigned char>(c) >= 128)
{
// Write octal escape
os << "\\" << setfill('0') << setw(3) << oct << static_cast<unsigned int>(c & 0xFF);
}
else if(c == '\\')
{
if(i + 1 == value.size())
{
// trailing backslash, add a second one
os << "\\\\";
}
else
{
c = value[++i];
if(c == '\\')
{
os << "\\\\";
}
else if(c == 'u' || c == 'U')
{
//
// Convert code point to UTF-8 bytes and write the escaped bytes
//
size_t sz = c == 'U' ? 8 : 4;
string codePointStr = value.substr(i + 1, sz);
assert(codePointStr.size() == sz);
IceUtil::Int64 v = IceUtilInternal::strToInt64(codePointStr.c_str(), 0, 16);
os << generator.escapeCodePoint(static_cast<unsigned int>(v));
i += sz;
}
else
{
// unescaped backslash
os << "\\\\";
os << generator.escapeASCIIChar(c);
}
}
}
else
{
os << generator.escapeASCIIChar(c);
}
}
}
return os.str();
}
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